diff --git a/stretch/preferences.d/stretch-backports b/stretch/preferences.d/stretch-backports
index 655baa1..db52476 100644
--- a/stretch/preferences.d/stretch-backports
+++ b/stretch/preferences.d/stretch-backports
@@ -94,3 +94,6 @@ Package: python3-zope.event
 Pin: release a=stretch-backports
 Pin-Priority: 900
 
+Package: python3-certbot-dns-rfc2136
+Pin: release a=stretch-backports
+Pin-Priority: 900